In a large bowl, cream the butter, sugars, and espresso powder until the espresso is dissolved and the texture is creamy. Beat in the egg until smooth again. In a separate bowl, stir together the cinnamon, flour, and salt, then add them to the butter mixture, stirring only until combined. Toss in the chocolate and the heath bar bits, mixing until well-distributed.

Break the dough into two semi-equal pieces. Roll each into about a 10-inch long log, as round as you can get it. Chill in the freezer for an hour (you can also chill in the fridge for a day or two, or keep frozen for a month).